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Abstract:

An antenna with multiple resonating conditions includes a grounding
element electrically connected to a ground, a radiating element, a
connection element electrically connected between the grounding element
and the radiating element, a feed-in element electrically connected
between the connection element and the grounding element for receiving
feed-in signals, and a radiating-condition generating element
electrically connected to the grounding element and extending from the
grounding element to the radiating element.

Claims:

1. An antenna with multiple resonating conditions, comprising: a
grounding element, electrically connected to a ground; a radiating
element; a connection element, electrically connected between the
grounding element and the radiating element; a feed-in element,
electrically connected between the connection element and the grounding
element, for receiving feed-in signals; and a radiating-condition
generating element, electrically connected to the grounding element, and
extending from the grounding element to the radiating element.

2. The antenna of claim 1, wherein the radiating element comprises: a
first radiator, extending along a first direction; and a second radiator,
electrically connected to the first radiator, and extending along an
opposite direction of the first direction; wherein the connection element
is electrically connected between the first radiator and the second
radiator.

3. The antenna of claim 1, wherein the connection element comprises: a
first branch, electrically connected between the radiating element and
the feed-in element; and a second branch, having a terminal electrically
connected between the first branch and the feed-in element, and another
terminal electrically connected to the grounding element.

4. The antenna of claim 1, wherein a shape of the radiating-condition
generating element corresponds to a shape of the connection element.

5. The antenna of claim 1, wherein the radiating-condition generating
element is close to the connection element, and extends from the
grounding element to the radiating element.

6. The antenna of claim 1, wherein the radiating-condition generating
element is further electrically connected to the radiating element.

7. The antenna of claim 1, wherein the radiating-condition generating
element comprises a plurality of branches extending from the grounding
element to the radiating element.

8. An antenna with multiple resonating conditions, comprising: a
grounding element, electrically connected a ground; a radiating element;
a connection element, electrically connected between the grounding
element and the radiating element; a feed-in element, electrically
connected between the connection element and the grounding element, for
receiving feed-in signals; and a plurality of radiating-condition
generating elements, electrically connected to the grounding element,
respectively, and extending from the grounding element to the radiating
element.

9. The antenna of claim 8, wherein the radiating element comprises: a
first radiator, extending along a first direction; and a second radiator,
electrically connected to the first radiator, and extending along an
opposite direction of the first direction; wherein the connection element
is electrically connected between the first radiator and the second
radiator.

10. The antenna of claim 8, wherein the connection element comprises: a
first branch, electrically connected between the radiating element and
the feed-in element; and a second branch, having a terminal electrically
connected between the first branch and the feed-in element, and another
terminal electrically connected to the grounding element.

11. The antenna of claim 8, wherein a shape of one of the plurality of
radiating-condition generating elements corresponds to a shape of the
connection element.

12. The antenna of claim 8, wherein one of the plurality of
radiating-condition generating elements is close to the connection
element, and extends from the grounding element to the radiating element.

13. The antenna of claim 8, wherein one of the plurality of
radiating-conditions generating elements is further electrically
connected to the radiating element.

14. The antenna of claim 8, wherein one of the plurality of
radiating-conditions generating elements comprises a plurality of
branches extending from the grounding element to the radiating element.

Description:

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to an antenna with multiple
resonating conditions, and more particularly, to an antenna generating
multiple resonating conditions with one or more radiating-condition
generating elements connected to ground, to achieve broadband operations.

[0003] 2. Description of the Prior Art

[0004] An antenna is used for transmitting or receiving radio waves, to
communicate or exchange wireless signals. An electronic product with a
wireless communication function, such as a laptop, a personal digital
assistant (PDA), usually accesses a wireless network through a built-in
antenna. Therefore, for facilitating the user to access the wireless
communication network more easily, an ideal antenna should have a wide
bandwidth and a small size to meet the trends of compact electronic
products within a permitting range, so as to integrate the antenna into a
portable wireless communication equipment.

[0005] In the prior art, one of the common antennas for wireless
communication is a planar inverted F antenna (PIFA), as implied by the
name, whose shape is similar to a rotated and inverted "F". Please refer
to FIG. 1A and FIG. 1B, FIG. 1A is a schematic diagram of a conventional
PIFA antenna 10, and FIG. 1B is a schematic diagram of voltage standing
wave ratio (VSWR) of the PIFA antenna 10. As shown in FIG. 1A, the PIFA
antenna 10 includes a grounding element 100, a radiating element 102, a
connection element 104 and a feed-in element 106. The connection element
104 connects the grounding element 100 and the radiating element 102,
such that a resonating path of a monopole antenna is reduced from a half
wavelength to a quarter wavelength, and thus the size of the antenna can
be reduced effectively.

[0006] Besides, as can be seen from FIG. 1B, the PIFA antenna 10 only has
one resonating condition. However, as the wireless communication
technology progresses, operating frequencies of different wireless
communication systems may be different; therefore, an ideal antenna
should cover bandwidths of different wireless communication networks
within a single antenna. In such a situation, the prior art further
derives a dual-band antenna with two resonating conditions from the PIFA
antenna 10.

[0007] Please refer to FIG. 2A and FIG. 2B. FIG. 2A is a schematic diagram
of a conventional dual-band antenna 20, and FIG. 2B is a schematic
diagram of VSWR of the dual-band antenna 20. The dual-band antenna 20
includes a grounding element 200, a radiating element 202, a connection
element 204 and a feed-in element 206. The radiating element 202 is
composed of a first radiator 2020 and a second radiator 2022
corresponding to high frequency band and low frequency band,
respectively. The connection element 204 is composed of branches 2040 and
2042 connected together. The branch 2040 is connected to the radiating
element 202 and the feed-in element 206, and the branch 2042 is connected
to the feed-in element 206 and the grounding element 202. As can be seen
from FIG. 2A, the dual-band antenna 20 has advantages of low profile,
i.e. a small height, small size and easy production. Meanwhile, as can be
seen from FIG. 2B, the dual-band antenna 20 has dual resonating
conditions suitable for dual-band application, and achieves the
optimization of the antenna characteristic.

[0008] Although the dual-band antenna 20 can achieve dual resonating
conditions, for a wireless communication system with broad bandwidth,
such as long term evolution (LTE) system, the bandwidth of the dual-band
antenna 20 is still not enough, resulting in limitations of its
application range. Therefore, how to increase bandwidth of an antenna has
become one of the goals in the wireless technology industry.

SUMMARY OF THE INVENTION

[0009] It is therefore an object to provide an antenna with multiple
resonating conditions.

[0010] An antenna with multiple resonating conditions includes a grounding
element electrically connected to a ground, a radiating element, a
connection element electrically connected between the grounding element
and the radiating element, a feed-in element electrically connected
between the connection element and the grounding element for receiving
feed-in signals, and a radiating-condition generating element
electrically connected to the grounding element and extending from the
grounding element to the radiating element.

[0011] An antenna with multiple resonating conditions includes a grounding
element electrically connected a ground, a radiating element, a
connection element electrically connected between the grounding element
and the radiating element, a feed-in element electrically connected
between the connection element and the grounding element for receiving
feed-in signals, and a plurality of radiating-condition generating
elements electrically connected to the grounding element respectively and
extending from the grounding element to the radiating element.

[0012] These and other objectives of the present invention will no doubt
become obvious to those of ordinary skill in the art after reading the
following detailed description of the preferred embodiment that is
illustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1A is a schematic diagram of a conventional PIFA antenna.

[0014] FIG. 1B is a schematic diagram of VSWR of the PIFA antenna.

[0015]FIG. 2A is a schematic diagram of a conventional dual-band antenna.

[0016]FIG. 2B is a schematic diagram of VSWR diagram of the dual-band
antenna.

[0017] FIG. 3 is a schematic diagram of an antenna according to an
embodiment of the present invention.

[0018] FIG. 4 is a schematic diagram of an antenna according to an
embodiment of the present invention.

[0019] FIG. 5A is a schematic diagram of an antenna according to an
embodiment of the present invention.

[0020] FIG. 5B is a schematic diagram of VSWR of the antenna shown in FIG.
5A.

[0021] FIG. 6A is a schematic diagram of an antenna according to an
embodiment of the present invention.

[0022] FIG. 6B is a schematic diagram of VSWR of the antenna shown in FIG.
6A.

DETAILED DESCRIPTION

[0023] Please refer to FIG. 3, which is a schematic diagram of an antenna
30 according to an embodiment of the present invention. The antenna 30
has multiple resonating conditions, and includes a grounding element 300,
a radiating element 302, a connection element 304, a feed-in element 306
and a radiating-condition generating element 308. The grounding element
300 is electrically connected to a ground for providing grounding. The
radiating element 302 is composed of a first radiator 3020 and a second
radiator 3022 extending along different directions and with different
lengths to provide two different radiation frequency bands. The
connection element 304 is composed of a first branch 3040 and a second
branch 3042. The first branch 3040 is connected to the radiating element
302 and the feed-in element 306, and the second branch 3042 is connected
to the feed-in element 306 and the grounding element 302. Therefore,
comparing FIG. 3 with FIG. 2, structures of the antenna 30 and the
dual-band antenna 20 are similar, while the difference is that the
antenna 30 adds the radiating-condition generating element 308. As shown
in FIG. 3, the radiating-condition generating element 308 is extended
from the grounding element 300 to the radiating element 302, and has a
shape substantially conforming to a shape of the connection element 304.
Therefore, a coupling effect between the radiating-condition generating
element 308 and the radiating element 302 or the connection element 304
generates an extra current path, so as to resonate another radiating
condition.

[0024] In short, the antenna 30 resonates dual radiating conditions
through the radiating element 302, and further resonate another radiating
condition through the radiating-condition generating element 308
connected to the ground, so as to achieve effects of multiple radiating
conditions or broadband. Noticeably, the present invention is to provide
extra current path to the ground through the radiating-condition
generating element 308, so as to increase radiating conditions, and those
skilled in this art should make modifications or alterations accordingly.
For example, in FIG. 3, the radiating-condition generating element 308 is
only connected to the grounding element 300, and not connected to the
radiating element 302. In practice, the radiating-condition generating
element 308 can connect to the radiating element 302 as well. Please
refer to FIG. 4, which is a schematic diagram of an antenna 40 according
to an embodiment of the present invention. Structures of the antenna 40
and the antenna 30 shown in FIG. 3 are similar, and thus same elements
are denoted by the same symbols. Difference between the antenna 40 and
the antenna 30 is that a radiating-condition generating element 408 of
the antenna 40 is connected between the grounding element 300 and the
radiating element 302, which belongs to double grounding structure of the
present invention, and thus effects of multiple radiating conditions or
broad band can be achieved as well.

[0025] Besides, in the antennas 30 and 40, the shapes of the
radiating-condition generating elements 308 and 408 both substantially
conform to a meander shape of the connection element 304. However, not
limit to this, in the present invention, the radiating-condition
generating element can be any kinds of shapes or be composed of multiple
branches depending on the system requirements. For example, please refer
to FIG. 5A, which is a schematic diagram of an antenna 50 according to an
embodiment of the present invention. Structures of the antenna 50 and the
antenna 40 shown in FIG. 4 are similar, and thus same elements are
denoted by the same symbols. Difference between the antenna 50 and the
antenna 40 is that a radiating-condition generating element 408 of the
antenna 50 is not only connected between the grounding element 300 and
the radiating element 302, but also composed of two branches 5080 and
5082, which belongs to the double grounding structure of the present
invention, and thus effects of multiple radiating conditions or broadband
can be achieved as well.

[0026] Please continue to refer to FIG. 5B, which is a schematic diagram
of VSWR of the antenna 50. As can be seen from FIG. 5, the antenna 50 can
further generate a resonating radiating condition in high frequency band,
and thus achieve multiple radiating conditions.

[0027] According to the above embodiments, the present invention resonates
extra radiating conditions mainly through the radiating-condition
generating element connected to the ground to achieve multiple radiating
conditions or broadband operations. However, noticeably, as shown in FIG.
3 to FIG. 5, shape, position of the radiating-condition generating
element, number of branches possessed by the radiating-condition
generating element or whether the radiating-condition generating element
is connected to the radiating element are not limited, those skilled in
this art should make modifications accordingly, such that the resonating
conditions generated by the radiating-condition generating element meet
the system requirements, so as to achieve effects of multiple radiating
condition or broadband operations. In addition, number of the
radiating-condition generating element is not limited either, e.g. the
present invention can further install multiple radiating-condition
generating elements 308 in the antenna 30, install multiple
radiating-condition generating elements 408 in the antenna 40, or share
the radiating-condition generating element 308 and the
radiating-condition generating element 408.

[0028] For example, please refer to FIG. 6A, which is a schematic diagram
of an antenna 60 according to an embodiment of the present invention.
Structures of the antenna 60 and the antenna 40 shown in FIG. 4 are
similar, and thus same elements are denoted by the same symbols.
Difference between the antenna 60 and the antenna 40 is that the antenna
60 further adds a radiating-condition generating element 610 in addition
to the radiating-condition generating element 408, and the
radiating-condition generating element 610 is connected to the grounding
element 300 but not connected to the radiating element 302, which is
similar to the radiating-condition generating element 308. In such a
situation, please continue to refer to FIG. 6B, which is a schematic
diagram of VSWR of the antenna 60. As can be seen from FIG. 6B, the
antenna 60 can generate 5 radiating conditions, and thus increase numbers
of radiating conditions effectively.

[0029] It is known from above illustration, through increasing
radiating-condition generating elements, the present invention can
increase resonating conditions effectively, so as to improve antenna
bandwidth. More important, as shown in FIG. 3, 4, 5A and 6A, the
radiating-condition generating elements 308, 408, 508,608 and 610 all
extend from the grounding element 300 to the radiating element 302. In
other words, the present invention does not change appearance of the
antenna, but lower the height of the antenna and reduce the antenna size
effectively.

[0030] Noticeably, the abovementioned embodiments are used for
illustrating concept of the present invention, those skilled in the art
should make modifications accordingly, but not limit to this. For
example, materials of the antennas 30, 40, 50, 60 can be metal materials,
such as iron and copper, and the antennas 30, 40, 50, 60 can be disposed
on another substrate, e.g. a printed circuit board (PCB). Furthermore, in
FIG. 3, 4, 5A, 6A, each element is combined through direct connection,
but not limit to this; for example, the grounding element 300 can be
disposed on a substrate, while other elements can be disposed on another
substrate, and both are connected by a flexible interface, and such
operation is also one of alterations of the present invention. Besides,
since antenna theory is well known by those skilled in the art,
principles of antenna radiation are omitted for simplicity. In practice,
when those skilled in the art design an antenna with multiple resonating
conditions according to the present invention, characters such as sizes,
materials and positions of elements should be adjusted according to the
system requirement.

[0031] To sum up, the present invention adds one or multiple
radiating-condition generating elements connected to the ground, such
that the antennas resonates multiple radiating conditions to achieve
broadband operations.

[0032] Those skilled in the art will readily observe that numerous
modifications and alterations of the device and method may be made while
retaining the teachings of the invention. Accordingly, the above
disclosure should be construed as limited only by the metes and bounds of
the appended claims.